Citation: CONG Yan-Qing, LI Zhe, WANG Qi, ZHANG Yi, XU Qian, FU Fang-Xia. Enhanced Photoeletrocatalytic Activity of TiO₂ Nanotube Arrays Modified with Simple Transition Metal Oxides (Fe₂O₃, CuO, NiO)[J]. Acta Physico-Chimica Sinica, ;2012, 28(06): 1489-1496. doi: 10.3866/PKU.WHXB201203221 shu

Enhanced Photoeletrocatalytic Activity of TiO₂ Nanotube Arrays Modified with Simple Transition Metal Oxides (Fe₂O₃, CuO, NiO)

1.
College of Environmental Science and Engineering, Zhejiang ngshang University, Hangzhou 310012, P. R. China

Received Date: 9 January 2012
Available Online: 22 March 2012
Fund Project: 国家自然科学基金(20976162, 21103149, 20906079) (20976162, 21103149, 20906079) 浙江省自然科学基金(R5100266) (R5100266)浙江省科技厅重大专项(2010C13001)资助项目 (2010C13001)

Composite electrodes consisting of highly ordered, vertically oriented TiO₂ nanotube (TiO₂-NT) arrays modified with Fe₂O₃, CuO, and NiO nanoparticles were successfully fabricated by a simple electrochemical anodization and electrodeposition method. Field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and UV-Vis diffuse reflectance spectroscopy were used to characterize the structure and optical properties of the resulting Fe₂O₃/TiO₂-NT, CuO/TiO₂-NT, and NiO/TiO₂-NT composite electrodes. The photoelectrochemical (PEC) activities of the composite electrodes were evaluated using phenol as a model pollutant. Results indicated that transition metal oxide nanoparticles were deposited on the mouth, tube wall, and base of the TiO₂-NTs. The PEC activity of the composite electrodes was over twice that of an unmodified TiO₂-NT electrode. The Fe₂O₃/TiO₂-NT electrode showed the highest absorption intensity in the visible light region. After treatment for 120 min, the phenol removal efficiency using the Fe₂O₃/TiO₂-NT anode could reach 96%, while it was only 41% for the unmodified TiO₂-NT anode. Moreover, the Fe₂O₃/TiO₂-NT electrode tended to generate intermediates of low toxicity. The higher PEC activity of the composite electrodes was attributed to the presence of hetero-nanostructures with high interfacial area comprised of TiO₂-NTs and transition metal oxide nanoparticles, which efficiently facilitated electron transfer and inhibited the recombination of photogenerated electron- hole pairs.
- TiO₂ nanotube,
- Fe₂O₃,
- CuO,
- NiO,
- Photoelectrocatalysis,
- Visible light
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通讯作者: 陈斌, bchen63@163.com

Enhanced Photoeletrocatalytic Activity of TiO₂ Nanotube Arrays Modified with Simple Transition Metal Oxides (Fe₂O₃, CuO, NiO)